Topic
Effective mass (solid-state physics)
About: Effective mass (solid-state physics) is a research topic. Over the lifetime, 12539 publications have been published within this topic receiving 295485 citations.
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TL;DR: The electron effective mass of n-type ZnO obtained recently by the cyclotron resonance is compared with the quasiparticle mass predicted by the GW approximation which takes into account the dynamical screening effects within the random phase approximation.
Abstract: The electron effective mass of n-type ZnO obtained recently by the cyclotron resonance is compared with the quasiparticle mass predicted by the GW approximation which takes into account the dynamical screening effects within the random phase approximation. The bare electron effective mass has been determined to be about 0.23 m 0 ( B ∥ c -axis) by cyclotron resonance experiments excluding electron–phonon coupling. On the other hand, the calculated quasiparticle mass has been obtained as about 0.24 m 0 . We have found that the dynamical screening effect enhances the mass obtained by the conventional local density approximation by about 17% and the predicted quasiparticle mass is in good agreement with the experiment.
91 citations
TL;DR: In this paper, the authors study the quantum effects of radiation pressure in a high-finesse cavity with a mirror coated on a mechanical resonator and show that the optomechanical coupling can be described by an effective susceptibility which takes into account every acoustic modes of the resonator, and their coupling to the light.
Abstract: We study the quantum effects of radiation pressure in a high-finesse cavity with a mirror coated on a mechanical resonator. We show that the optomechanical coupling can be described by an effective susceptibility which takes into account every acoustic modes of the resonator and their coupling to the light. At low frequency this effective response is similar to a harmonic response with an effective mass smaller than the total mass of the mirror. For a plano-convex resonator the effective mass is related to the light spot size and becomes very small for small optical waists, thus enhancing the quantum effects of optomechanical coupling.
91 citations
TL;DR: In this article, the Schrodinger equation for spatially varying effective mass was used to study the transmission probability of the scattering problem with a position dependent mass barrier and its properties were obtained.
Abstract: Transmission probabilities of the scattering problem with a position dependent
mass are studied. After sketching the basis of the theory, within the context of
the Schrodinger equation for spatially varying effective mass, the
simplest problem, namely, transmission through a square well potential with
a position dependent mass barrier is studied and its novel properties are obtained.
The solutions presented here may be advantageous in the design of
semiconductor devices.
91 citations
TL;DR: In this article, a parametric self-consistency method utilizing the triangular well approximation is used for the electrostatics of the inversion layer of metal-oxide-semiconductor field effect transistors.
Abstract: We present a physical model to calculate the direct tunneling hole current through ultrathin gate oxides from the inversion layer of metal–oxide–semiconductor field-effect transistors. A parametric self-consistency method utilizing the triangular well approximation is used for the electrostatics of the inversion layer. For hole quantization in the inversion layer, an improved one-band effective mass approximation, which is a good approximation to the rigorous six-band effective mass theory, is used to account for the band-mixing effect. The tunneling probability is calculated by a modified Wentzel–Kramers–Brilliouin (WKB) approximation, which takes the reflections near the Si/SiO2 interfaces into account. It is found that the parabolic dispersion in the SiO2 band gap used in the WKB approximation is only applicable for hole tunneling in oxides thinner than about 2 nm and for low gate voltage. A more reasonable Freeman–Dahlke hole dispersion form with significantly improved fitting to all experimental data...
91 citations
TL;DR: In this article, a dual-resonator microstructure design is proposed for acoustic metamaterials to achieve broadband effective mass negativity, and the effect of wave attenuation over a wider frequency spectrum is demonstrated.
Abstract: A dual-resonator microstructure design is proposed for acoustic metamaterials to achieve broadband effective mass negativity. We demonstrate the advantage of acoustic wave attenuation over a wider frequency spectrum as compared to the narrow band gap of a single-resonator design. We explicitly confirm the effect of negative effective mass density by analysis of wave propagation using finite element simulations. Examples of practical application like vibration isolation and blast wave mitigation are presented and discussed.
91 citations